I'm nearing the end of my 450 Bushmaster build and I need an extra opinion regarding headspacing. I have proper gauges on the way but in the mean time I wanted to get everything together in it's proper place when I was working on my stock so I went ahead and set it up with an unfired factory round.

Here's where I'm at currently with everything tightened up,

Bolt closes on unfired factory round without resistance
Bolt closes with very slight pressure with .002" brass shim stock
Bolt engages but won't fully close on .003" brass shim
Bolt will not move on .004" brass shim

My question is since from what I've read this seems ideal would you guys recommend me to disassemble and completely start over when the gauges get here? Or if it closes on the go but doesn't on no go just leave it alone? I'm trying to minimize the amount of wrenching that I have to do on the new cerakote but I also want to make sure it's right.

FWIW I don't reload so most likely factory ammo is all that will ever be fired from this rifle.